There are good reasons to do it to be honest (aside from people not knowing about these types of domains, DNS servers also need to be maintained to keep this kind of delegation working which isn't free, and then there's the whole problem the public suffix list is trying to solve).
There's no strict need to do it, let alone to do it now, but an eventual transition does make sense, if spread out over a couple of years with guaranteed backwards compatibility and maintaining existing domains and ownership.
There are good reasons to do it to be honest (aside from people not knowing about these types of domains, DNS servers also need to be maintained to keep this kind of delegation working which isn't free, and then there's the whole problem the public suffix list is trying to solve).
There's no strict need to do it, let alone to do it now, but an eventual transition does make sense, if spread out over a couple of years with guaranteed backwards compatibility and maintaining existing domains and ownership.